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Nuclear spin polarization and control in hexagonal boron nitride.

Xingyu Gao1, Sumukh Vaidya1, Kejun Li2

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Researchers achieved optical control of nuclear spins in van der Waals materials at room temperature. This breakthrough utilizes boron vacancy defects to enable fast manipulation and strong coupling for quantum information applications.

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Area of Science:

  • Condensed-matter physics
  • Spintronics
  • Quantum information science

Background:

  • Electron spins in van der Waals materials are key to spintronics.
  • Nuclear spins in these materials are an underutilized quantum resource.

Purpose of the Study:

  • To report optical polarization and coherent control of nuclear spins in van der Waals materials at room temperature.
  • To explore the potential of nuclear spins as a quantum resource.

Main Methods:

  • Utilizing negatively charged boron vacancy ([Formula: see text]) spin defects in hexagonal boron nitride.
  • Optical polarization and coherent control techniques.
  • Measuring Rabi frequency and nuclear-nuclear spin coupling.

Main Results:

  • Achieved optical polarization and coherent control of nuclear spins at room temperature.
  • Observed a 350-fold increase in nuclear spin Rabi frequency using [Formula: see text] defects.
  • Demonstrated fast coherent control of nuclear spins.
  • Detected electron-mediated nuclear-nuclear spin coupling five orders of magnitude stronger than direct dipolar coupling.

Conclusions:

  • This work establishes a new method for manipulating nuclear spins in van der Waals materials.
  • Opens avenues for quantum information science and technology using nuclear spins.
  • Highlights the potential of hexagonal boron nitride as a platform for quantum applications.